Malicious PDF — malware analysis report

Static analysis result for SHA-256 9136ca6b435d78b7…

MALICIOUS

PDF

107.4 KB Created: 2021-08-07 06:50:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: c3a9edf60ce5467995a8d949b6b71a0d SHA-1: d8e37832e8f487c61f5d3ddfbe8a71129426839d SHA-256: 9136ca6b435d78b7e9d8626615ea721e35e67d4577c509662a8889fa9a299c0d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains numerous links, many pointing to compromised WordPress sites, suggesting it functions as a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9863

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160af97b3b2f33---88863457192.pdf In PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/raq7u4j4nnlpgaers7njvjo1mt/nipixinajunul.pdfIn PDF document text
    • http://3dprofi.net/images/uploads/file/69298963770.pdfIn PDF document text
    • https://sunrise-photon.com/upfiles/editor/files/26256133113.pdfIn PDF document text
    • https://cafemocion.com/userfiles/file/lumefedewamegomej.pdfIn PDF document text
    • https://tagoproperties.com/ckfinder/userfiles/files/87387063137.pdfIn PDF document text
    • http://thekitchendesignstudio.org/uploads/files/96182084716.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160e627154d037---bomuzufezokugiliw.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606c805fc419f---4070813991.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/pk3qn9qup5k0o28cu00b3hbp94/74209901502.pdfIn PDF document text
    • https://trellisdundee.com/wp-content/plugins/super-forms/uploads/php/files/2b6d01dbed8f568fdc5eb9e9a4baba66/fowumal.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/1608d6d946254e---44989942552.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/726d58fbf9be526095761234d0ce9dca/sanopikanitanixamajober.pdfIn PDF document text
    • http://turhantur.com/turhantur/files/63817801682.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/86127e753c72b5d4aae272f5ea2d31fa/80909198402.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/kqcdq02c6ag0m2d0t6ebmvg7s0/54086116488.pdfIn PDF document text
    • https://pensiuneavalentina.ro/app/webroot/file/11616226716.pdfIn PDF document text
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608cee134e740---18665898828.pdfIn PDF document text
    • https://jclifeschools.org/wp-content/plugins/super-forms/uploads/php/files/ffa4cbd612f57a3643e4dd353bddd777/1423890142.pdfIn PDF document text
    • http://udaybharat.in/ckfinder/userfiles/files/botanivajafibigozaborazar.pdfIn PDF document text
    • https://terminarz.online/kosmetyczka/krakow/files/wakolomuxutixozujufazule.pdfIn PDF document text
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/39h8euhooha0r2cp2qecqsktk2/nivosafaze.pdfIn PDF document text
    • https://vietfun.com.vn/wp-content/plugins/super-forms/uploads/php/files/iooo31u6g4cgfdaoaitobcuv5o/vevida.pdfIn PDF document text
    • https://mumegram.com/userfiles/file/89639135431.pdfIn PDF document text
    • http://www.gulbaharsigorta.com/contentData/file/genezuresififuzowosukadal.pdfIn PDF document text
    • http://cyuanmei.com/userfiles/file/xiwakufuvoj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=10+s%C4%B1n%C4%B1f+biyoloji+ders+kitab%C4%B1+cevaplar%C4%B1+berkay+yay%C4%B1nlar%C4%B1+sayfaPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000123b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123B4 11276 bytes
SHA-256: 482ea6d37de218cc93c1cc0b92bf154bdee4040fe3022825447a6ce14944728f
font_01_sfnt_off00013e0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E0E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001561f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1561F 16088 bytes
SHA-256: 21ff46de98f0902b53a5c0c946916a1dd4551bbaa4204463728281c4bc54dda8
font_03_sfnt_off00016b53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16B53 19516 bytes
SHA-256: 06989a6650bf9120c4895450dae7aabcd6e36750be6381ef951a88f8e99bd946

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